Examine source code of Link Investigator

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "author": "Geoffrey De Belie",
  "version": "1.3.0",
  "homepage_url": "https://github.com/Smile4ever/link-investigator",
  "applications": {
    "gecko": {
      "id": "link-investigator@itsafeature.org"
    }
  },
  "icons": {
    "64": "icons/link-investigator-64.png",
    "512": "icons/link-investigator-512.png"
  },
  "permissions": [
    "<all_urls>",
    "contextMenus",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background/background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/investigator.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "check-page": {
      "suggested_key": {
        "default": "F4"
      }
    },
    "check-selection": {
      "suggested_key": {
        "default": "Shift+F4"
      }
    }
  },
  "default_locale": "en",
  "browser_action": {
    "default_icon": "icons/link-investigator-512.png",
    "browser_style": true
  },
  "web_accessible_resources": [
    "icons/link-investigator-64.png",
    "icons/alert.png",
    "icons/cool.png",
    "icons/dead.png",
    "icons/muted.png",
    "icons/monkey.png"
  ]
}